Dissolution of Black Copper Oxides from a Leaching Residue
This article presents the behavior of black copper minerals in reducing acid leaching using FeSO<sub>4</sub> as reducing agent. The original sample, which was a blend of green and black copper minerals, was treated first by an oxidizing acid leach using O<sub>3</sub> to disso...
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doaj-33bb01c9697447cdb919ead340e5a9dd2020-11-25T03:37:40ZengMDPI AGMetals2075-47012020-07-01101012101210.3390/met10081012Dissolution of Black Copper Oxides from a Leaching ResidueVíctor Quezada0Oscar Benavente1Cristopher Beltrán2Danny Díaz3Evelyn Melo4Antonio García5Laboratorio de Investigación de Minerales Sulfurados, Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, 1270709 Antofagasta, ChileLaboratorio de Investigación de Minerales Sulfurados, Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, 1270709 Antofagasta, ChileLaboratorio de Investigación de Minerales Sulfurados, Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, 1270709 Antofagasta, ChileLaboratorio de Investigación de Minerales Sulfurados, Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, 1270709 Antofagasta, ChileLaboratorio de Investigación de Minerales Sulfurados, Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, 1270709 Antofagasta, ChileLaboratorio de Investigación de Minerales Sulfurados, Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, 1270709 Antofagasta, ChileThis article presents the behavior of black copper minerals in reducing acid leaching using FeSO<sub>4</sub> as reducing agent. The original sample, which was a blend of green and black copper minerals, was treated first by an oxidizing acid leach using O<sub>3</sub> to dissolve the soluble phase (green copper oxides). The residue (mainly black copper) was evaluated by agitated leaching under three different solution potentials, with respect to the standard hydrogen electrode (SHE) (450, 500, and 600 mV (SHE)) at 25 °C. The original sample and the leach residue were characterized by scanning electron microscope (SEM) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The O<sub>3</sub> leach residue was 1.43% copper, with 50% of the insoluble phase associated with copper pitch, copper limonites, and unreacted chrysocolla. The results of leaching using FeSO<sub>4</sub> demonstrate that it is possible to obtain 90% copper extraction using a solution with a potential of 450 mV, while leaching at 600 mV resulted in 65% copper extraction. Acid consumption was 40 kg/t in the test at 450 mV, followed by 30 kg/t in the 500 mV test, and finally 25 kg/t in the 600 mV test, showing that reactivity decreases with increased solution potential. The results show that retreatment of a leaching residue is possible, considering the presence of copper pitch, copper limonites, and chrysocolla as the main copper contributing minerals. Modeling of copper extraction with nonlinear regression is proposed. The retreatment of residues resulting from conventional acid leaching can be an alternative to make use of the treatment capacity of hydrometallurgical plants.https://www.mdpi.com/2075-4701/10/8/1012copper pitchcopper wadmanganeseleaching |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Víctor Quezada Oscar Benavente Cristopher Beltrán Danny Díaz Evelyn Melo Antonio García |
spellingShingle |
Víctor Quezada Oscar Benavente Cristopher Beltrán Danny Díaz Evelyn Melo Antonio García Dissolution of Black Copper Oxides from a Leaching Residue Metals copper pitch copper wad manganese leaching |
author_facet |
Víctor Quezada Oscar Benavente Cristopher Beltrán Danny Díaz Evelyn Melo Antonio García |
author_sort |
Víctor Quezada |
title |
Dissolution of Black Copper Oxides from a Leaching Residue |
title_short |
Dissolution of Black Copper Oxides from a Leaching Residue |
title_full |
Dissolution of Black Copper Oxides from a Leaching Residue |
title_fullStr |
Dissolution of Black Copper Oxides from a Leaching Residue |
title_full_unstemmed |
Dissolution of Black Copper Oxides from a Leaching Residue |
title_sort |
dissolution of black copper oxides from a leaching residue |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2020-07-01 |
description |
This article presents the behavior of black copper minerals in reducing acid leaching using FeSO<sub>4</sub> as reducing agent. The original sample, which was a blend of green and black copper minerals, was treated first by an oxidizing acid leach using O<sub>3</sub> to dissolve the soluble phase (green copper oxides). The residue (mainly black copper) was evaluated by agitated leaching under three different solution potentials, with respect to the standard hydrogen electrode (SHE) (450, 500, and 600 mV (SHE)) at 25 °C. The original sample and the leach residue were characterized by scanning electron microscope (SEM) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The O<sub>3</sub> leach residue was 1.43% copper, with 50% of the insoluble phase associated with copper pitch, copper limonites, and unreacted chrysocolla. The results of leaching using FeSO<sub>4</sub> demonstrate that it is possible to obtain 90% copper extraction using a solution with a potential of 450 mV, while leaching at 600 mV resulted in 65% copper extraction. Acid consumption was 40 kg/t in the test at 450 mV, followed by 30 kg/t in the 500 mV test, and finally 25 kg/t in the 600 mV test, showing that reactivity decreases with increased solution potential. The results show that retreatment of a leaching residue is possible, considering the presence of copper pitch, copper limonites, and chrysocolla as the main copper contributing minerals. Modeling of copper extraction with nonlinear regression is proposed. The retreatment of residues resulting from conventional acid leaching can be an alternative to make use of the treatment capacity of hydrometallurgical plants. |
topic |
copper pitch copper wad manganese leaching |
url |
https://www.mdpi.com/2075-4701/10/8/1012 |
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